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ACBC Interaction

Is there a straight forward way to check whether an interaction should be used for HB modelling?
Theroretically I have 4 interactions between two variables. Not sure whether I should include it in HB or not.

For sure prct cert. increases from .58 to about .76 when i use the interactions but maybe this is due to overfitting?

So - without having some latent class software  - how can I check whether it makes sense?

Thank you!
asked Sep 18, 2012 by anonymous

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